1. 视窗：
Windows 是一组由 Microsoft Incorporation 提供的各种专有图形操作系统。它也被称为Microsoft Windows 。它目前包括 Windows NT 和 Windows IoT 作为其家族成员。早些时候，它包括不再使用的 Windows 9x、Windows Mobile 和 Windows Phone。它是个人计算机中最常用的操作系统。微软于 1985 年推出了 Windows 的第一个版本。它具有带有模块的混合内核。
2. OpenBSD：
OpenBSD 是由 OpenBSD 项目提供的一个专注于安全的免费开源操作系统。它基于 Berkeley Software Distribution。它是一个类Unix操作系统。它可用于许多平台，包括服务器、NAS、工作站和嵌入式系统。它基本上是用C语言、汇编语言、Perl和Unix shell编写的。 OpenBSD 的第一个版本于 1995 年推出。这个操作系统中使用的内核是单片的。
Windows 和 OpenBSD 的区别：
| S.No. | WINDOWS | OPENBSD |
|---|---|---|
| 1. | It was developed and is owned by Microsoft Incorporation. | It was developed and is owned by The OpenBSD Project. |
| 2. | It was launched in 1985. | It was launched in 1995. |
| 3. | It is not an open source operating system. | It is an open source operating system. |
| 4. | Its target systems types are workstation, personal computers, media center, tablets and embedded systems. | Its target system types are server, NAS, workstation and embedded systems. |
| 5. | Computer architectures supported by Windows are IA-32, x86-64, IA-64, ARM, Alpha, MIPS and PowerPC. | Computer architectures supported by OpenBSD are IA-32, x86-64, SPARC, 68k, Alpha and VAX. |
| 6. | Its kernel type is Hybrid with modules. | Its kernel type is Monolithic. |
| 7. | Its native APIs are Win32 and NT API. | Its native APIs are BSD-POSIX. |
| 8. | It has the preferred license Proprietary and Source available. | It has the preferred license of ISC. |
| 9. | The non-native APIs supported through its subsystems are DOS API, Win16, POSIX and .NET. | The non-native APIs are not supported through its subsystems. |
| 10. | File systems supported by Windows are NTFS, FAT, ISO 9660, UDF, HFS+, FATX and HFS. | File systems supported by OpenBSD are ffs, ext2, FAT, ISO 9660 and NFS. |
| 11. | Its package management is MSI or custom installer. | Its package management is Ports collection/packages. |
| 12. | Its update management is Windows Update. | Its update management is by source or by binary. |